Abstract: A shale shaker that includes a base, a basket, a vibrator interconnected with the basket, and two shaker screens releasably mounted on the basket, with the first shaker screen having a discharge end, with the second screen having a first end with a seal abutted thereto, with the second screen positioned such that the seal is positioned below the first shaker screen, and positioned so that discharge from the first screen will not discharge onto the seal.

Abstract: The present discloses a waste screening apparatus comprising: a main body; a waste screener vertically and tiltedly disposed in the main body to screen wastes in the input water and to allow waste-removed water to be discharged through water discharge holes defined in both side faces of the main body respectively, wherein the waste screener vertically circulates in a conveyor manner, wherein the input water is input to a front, rear and bottom of the waste screener; wherein the main body includes: both side walls having the water discharge holes defined therein respectively to allow waste-removed water to be discharged out from the waste screener therethrough; and a rear blocking wall disposed at a rear of the waste screener to be spaced from the waste screener, wherein the input water passes through front and rear portions of the waste screener with wastes being removed from the input water, and, then, is discharged out through the water discharge holes defined in the both side walls respectively.

Abstract: A collection device for aquatic life and debris for a traveling water screen. The collection device allows sharing of water provided from a high pressure nozzle while shielding aquatic life from a high pressure spray produced by the high pressure nozzle. The collection device enables separate collection of items exposed to a high pressure spray and items protected from a high pressure spray while reducing water costs. The collection device includes a first compartment for collecting aquatic life collected by a water screen and a second compartment for collecting debris collected by the water screen. A shield dissipates or blocks a high pressure spray directed into the second compartment from entering the first compartment. A filter allows fluid to flow from the second compartment into the first compartment while blocking aquatic life in the first compartment from entering the second compartment.

Abstract: A screening system comprises a tank (20) containing a sewage screen (30), wherein the tank is configured for attachment to a sewage channel, and to receive sewage flow from an upstream point of the channel, and then to direct the sewage flow through the sewage screen (30), and then to return the screened sewage flow back into the channel, at a downstream point, or directly to a downstream treatment, and wherein the tank (20) is configured to decrease the velocity of the sewage flow in the tank relative to the channel, such that grit can settle at the bottom of the tank, and wherein the sewage screen (30) comprises a working screening surface (31), a portion of which lies in a substantially horizontal plane, and is positioned below the invert level of the sewage channel at the upstream point, when in use. Screen and tank used within the before mentioned system as well as the method of screening sewage using the system are also disclosed.

Abstract: Disclosed herein is an apparatus for filtering sewage and wastewater. The filtering apparatus has a vertical structure including a filtering belt comprising a filter bag or a filter mesh that can filter out fine impurities. For this, the filtering apparatus includes a drive motor that receives power to drive the apparatus, an upper drive drum that is operated by the drive motor, a lower rotating drum that is interlocked with the upper drive drum, and a filtering belt that is wound and rotated around the upper drive drum and the lower rotating drum. The filtering apparatus cannot only filter out fine impurities less than from 0.1 mm to 0.2 mm but also separate earth and sand, unlike conventional filtering apparatuses that cannot conduct them.

Abstract: A screening installation includes, provided in a flume (5) conveying a fluid flowing with a total flow QE: a screening device (10) including a screen which includes at least one filter member in order to screen a fraction Q10 of the total flow, at least one first passage (31) in the flume which is adapted to allow a fraction Q31 of the total flow to pass such that QE=Q10+Q31, so long as the head loss between the upstream side and the downstream side of the screening device is less than a predetermined value, and at least one second passage (32) in the flume which is adapted to allow a fraction Q32 of the total flow to pass such that QE=Q10+Q31+Q32 when the head loss is greater than the predetermined value.

Abstract: A screening grid for discharging solids from a liquid flow. The grid includes a driveable screening strip that can be inserted into the liquid flow and includes two lateral link chains between which carrying rods extend, carrying groups of adjacent screening links. All screening links include projecting parts that extend respectively only in one direction from a group of screening grids, without being overlapped by the projecting parts of the adjacent group of screening links. All of the screening links of a group are provided with projecting hooks on the outer side of the screening strip.

Abstract: A traveling screen machine having an active screen section arranged transverse to the flow direction of a liquid stream is suggested, wherein the endless screen belt is formed as an endless screen belt that is flexibly foldable, compressible or bendable transverse to its direction of movement.

Abstract: This invention comprises a main rotating removal screen that catches floating materials such as big jellyfishes, wood chips, waste plastics and other things floating in water by endless rotation and including nets that move the floating materials caught to a position higher than the water surface, a receiving tray is provided for receiving the floating material caught by the main rotating removal screen and sending it to a discharge line, a secondary lifting device is provided that cooperates with above mentioned main rotating removal screen to lift and transfer the floating materials caught by the receiving tray, a water jet system is provided for dislodging any caught floating materials that is lifted higher than the receiving tray when it is hooked on the rotating removal screen and not released to the receiving tray, and a cutting water jet system is provided to cut oversized floating material into an acceptable size.

Abstract: A traveling band screen machine (1) is proposed with a careful fish return. To this end, the screen panels (4) each have a fish lifting channel (26) in which fishes (28) in a liquid-filled collecting recess (27) are lifted out of the stream of liquid and then emptied in the upper guidance zone (21) of the endless screen band (6) in an emptying zone (29) of the screen band machine (1) into a catch collecting drain (30) by tilting the screen panel (4) and the collecting recess (27) before the screen panel (4) reaches the cleaning zone (14) with the spray nozzles (23), in which debris deposited from the sluice channel on the screen panel (4) is cleaned off into the debris collecting drain (24).

Abstract: The invention pertains to a conveyor belt filter device comprising: (a) an endless filter belt of flat, interconnected filter elements that can be respectively pivoted relative to one another about a horizontal link axis; (b) flexible driving means that are respectively provided to both sides of the filter belt and consist of a chain drive with deflection elements and two endless drive chains, on which the filter elements are laterally mounted; and (c) a framework that carries the deflection elements and the filter belt, wherein each filter element is rigidly mounted on a chain link and front surfaces of the filter element respectively feature an abutment edge that extends parallel to the link axes of the chain links, such that the opposite abutment edges define a filter gap formed between two filter elements, and wherein the filter gap is provided with a gap seal.

Abstract: A boot seal for a vertically traveling water screen and a method forming a boot seal. The boot seal comprises a bent plate that extends from an attachment end to a free end. The attachment end is attached to a frame mounted at the bottom of a channel of water flowing through the water screen. The boot seal is positioned just upstream of the upward-moving upstream face of the water screen. The free end of the bent plate in a rest position is positioned close to or lightly touching the upstream face of the water screen. The bent plate has a concave surface facing the water screen. The bent plate acts as a cam follower to a passing lift element's cam. As the lift element slides along the concave cam surface, the lift element pivots the boot plate in an upstream direction against a spring bias. When the lift element clears the boot plate, the boot plate springs back to its rest position.

Abstract: An apparatus and method are provided that enable the control of a screening operation based on a calculated screen blockage percentage and the velocity throughput of the screen. The apparatus includes an upstream level detector, a downstream level detector and a flow determining device which determines the volumetric flow through the screen. The apparatus may further include a blockage determination unit which determines the percent screen blockage based on the flow level upstream of the screen, the flow level downstream of the screen and the volumetric flow.

Abstract: A horizontally traveling water screen for filtering debris from a wide flowing stream. The water screen, which may be realized by a foraminous modular plastic conveyor belt, is formed in an endless loop trained between drive and idle sprockets rotatable on generally vertical shafts. The upstream face of the water screen is oriented transverse to the flow and advances horizontally across the stream to drag debris to a cleaning and discharge station. Horizontally spaced hold down tabs extending outward of the inner surface of the loop hook onto and ride along a horizontal guide attached to a support frame for the water screen to prevent the screen from sagging.

Abstract: Provided is a rotary bar screen device. The device includes a driving motor, an up/down pair of driving and driven sprockets, left and right transfer chains, a plurality of screen buckets, a removal unit, and a slide plate. The driving motor is provided over a support frame, and transmits a driving force. The driving and driven sprockets are driven by the driving force. The left and right transfer chains connect the driving and driven sprockets with each other while circulatively moving. The plurality of screen buckets are provided between the left and right transfer chains. The removal unit is provided between the left and right driving sprockets. The slide plate guides the foreign materials dropping from the screen buckets.

Abstract: A filtering device suitable for filtering a flow of fluid in a channel includes a plurality of filter elements coupled to one another to define a filter loop. The filter loop is configured to position a filter element in the channel to filter a portion of the flow of fluid. The filtering device also includes a plurality of resilient seal members. Each seal member is coupled to one of the plurality of filter elements such that the seal member is at least partially compressed by an adjacent filter element. At least one seal member inhibits the flow of fluid between the filter element to which the seal member is attached and the adjacent filter element.

Abstract: A compressible boot seal for sealing the side of a vertical traveling water screen with flights. The boot seal is formed by a U-shaped, bent nylon plate having a bottom base that resides in the boot section at the lower end of the traveling water screen and two upwardly extending arms that are attached at their distal ends to a side of the water screen support. The plate is bent at the intersection of the base and the arms to form a living hinge that allows the plate to deflect toward the side of the support on contact with side edges of the flights. The hinge seals the plate against the side edges of the flights. A resilient filler material fills the void between the plate and the side of the support to prevent sand and debris from interfering with the deflection of the side seal.

Abstract: Screening apparatus (101,901) for use at an overflow weir (301, 902) in a sewerage system. The apparatus comprises a continuous moving screen band (201, 902) and a band cleaning mechanism (608). A first portion (801) of the screen band is configured to move along the weir towards one of its ends, and a second portion (803) of the screen band is configured to move along the weir towards its opposite end. A steeper portion (805) of the screen band extends to an elevated position (806) above the first and second portions, and the band cleaning mechanism is arranged to remove solid matter from the screen at said elevated position.

Abstract: A compressible boot seal for sealing the side of a vertical traveling water screen with flights. The boot seal is formed by a U-shaped, bent nylon plate having a bottom base that resides in the boot section at the lower end of the traveling water screen and two upwardly extending arms that are attached at their distal ends to a side of the water screen support. The plate is bent at the intersection of the base and the arms to form a living hinge that allows the plate to deflect toward the side of the support on contact with side edges of the flights. The hinge seals the plate against the side edges of the flights. A resilient filler material fills the void between the plate and the side of the support to prevent sand and debris from interfering with the deflection of the side seal.

Abstract: A filter apparatus separates fine particles such as pine needles, threads, hairs and seeds from a liquid influent. A rotating grid assembly has multiple grid sections mounted by top-to-bottom connected links, supporting a filter media having specified openings sufficient for entrainment of miniscule particles. Grid sections are interchanged for collection and discharge of various sized particles using the same apparatus.

Abstract: There is disclosed an apparatus for removing solids from water in a canal during or immediately after a rainstorm. The apparatus includes a plurality of filters and a carrier. The filters filter the solids from the water while moving in and taking impact from the water. The carrier carries the filters in a cycle.

Abstract: The water intake rotary screen comprises a mobile filter designed as an endless loop formed of a succession of flexible and articulated filter panels. It is associated with a suction system adapted to generate a local contraflow through the filter to take up successively elements retained thereby and direct them to the exterior.

Abstract: A traveling water screen comprising an endless foraminous belt with flights. The foraminous belt forms a water screen extending from a lower end in a flowing stream to an upper end above the surface of the stream. The stream flows through openings in the foraminous screen. The flights, which may be scoops, are arranged in spaced apart relation on the outer surface of the water screen. The water screen is driven in a direction so that its upstream portion advances upward and its downstream portion downward. The flights form inclined surfaces across the width of the screen from a point of highest elevation to one or more points of lowest elevation at one or both side edges of the screen. As the screen moves, the flights lift fish toward the surface. As a flight breaks the surface, fish slide down the inclined flights toward one or both side edges of the screen to be diverted safely.

Abstract: A filtering device suitable for filtering a flow of fluid in a channel includes a plurality of filter elements coupled to one another to define a filter loop. The filter loop is configured to position a filter element in the channel to filter a portion of the flow of fluid. The filtering device also includes a plurality of resilient seal members. Each seal member is coupled to one of the plurality of filter elements such that the seal member is at least partially compressed by an adjacent filter element. At least one seal member inhibits the flow of fluid between the filter element to which the seal member is attached and the adjacent filter element.

Abstract: According to one aspect of the invention, there is provided a waste collection system for separating liquid waste from solid waste which includes a conveyor having an upper conveyor roller, a lower conveyor roller and an endless conveyor belt extending around the conveyor rollers. The upper run of the conveyor belt is upwardly concave. In cross section, the upper run has a lowermost portion and lateral portions diverging laterally and upwardly from the lowermost portion. The upper run is longitudinally inclined from the upper roller to the lower roller. A waste deflector extends above and along the lowermost portion of the upper run. Separate liquid and solid waste collectors are located in the vicinity of the upper and lower rollers. A conveyor drive is connected to on of the conveyor rollers.

Abstract: A fine filter screen assembly includes a frame assembly and a rotatable shaft supported in the frame. A drive is configured to controllably rotate the shaft and at least one drive drum is positioned on the shaft for rotation therewith. The drive drum has an external surface that is substantially defined by a high friction surface and a fine filter grid is supported in the frame assembly and positioned about and in contact with the drive drum such that rotation of the shaft causes rotation of the fine filter grid.

Abstract: A traveling water screen comprising an endless foraminous belt with flights. The foraminous belt forms a water screen extending from a lower end in a flowing stream to an upper end above the surface of the stream. The stream flows through openings in the foraminous screen. The flights, which may be scoops, are arranged in spaced apart relation on the outer surface of the water screen. The water screen is driven in a direction so that its upstream portion advances upward and its downstream portion downward. The flights form inclined surfaces across the width of the screen from a point of highest elevation to one or more points of lowest elevation at one or both side edges of the screen. As the screen moves, the flights lift fish toward the surface. As a flight breaks the surface, fish slide down the inclined flights toward one or both side edges of the screen to be diverted safely.

Abstract: A filter screen that is used in filtering water and that includes a frame and a grid assembly that is supported by the frame for movement. The grid assembly includes a continuous unbroken drive chain having a guide link, and a screen panel. The screen panel is coupled to the guide link for selective movement between an operating condition and a maintenance condition. When the screen panel is in the operating condition the screen panel is fixed relative to the guide link for movement with the guide link and for filtering water. In the maintenance condition, the screen panel is pivotable relative to the guide link to permit access to the interior of the filter screen for inspection of chain components.

Abstract: A fine filter screen assembly comprising a length of filter screen having a relatively fine filtering surface and terminating at opposite ends with opposed end shafts. Generally open connecting means interconnect the opposed end shafts to define a continuous loop structure. At least one removable filter grid having a substantially fine filtering surface is removably mounted between the opposed end shafts such that the continuous loop structure has a substantially continuous relatively fine filtering surface. Removal of the grid allows internal access to the screen assembly.

Abstract: A waste water filter screen assembly that has a substantially open foot section to promote more efficient flow through. The rotating grid is generally free hanging. The present invention further provides a drive assembly with square, high friction drive drums mounted on the drive shaft. The present invention further provides idler roller assemblies mounted for guiding the rotating grid adjacent the filter screen assembly head. The open foot section, drive assembly and idler roller assembly are useable with filter grids of both the link element type and the panel type.

Abstract: A wastewater treatment washer compactor system having in-channel motorized screen for installation in an influent channel and removal of screenings from the influent stream; at least one washer and at least one compactor for washing and dewatering the screenings; and system control means for coordinating and controlling the motor speed of the motorized screen, the washing cycle time and processing rate of the washer(s), and the compacting rate of the compactor(s).

Abstract: The invention relates to a sieving device for mechanically separating and extracting solid bodies or solid matter from a liquid current, in particular, to sieve gratings for process or effluent currents or for use in sewage treatment plants or hydroelectric power stations. Said device comprises a number of sieving panels (2, 2′, 2″) which are substantially arranged in a transverse direction to the direction of flow of the liquid current, are linked together, and which form a revolving endless sieve belt (1) immersing into the liquid current (20). The device also comprises a drive for the endless sieve belt (1), whereby the sieving panels (2, 2′, 2″) are arranged successively in such a way that the revolving motion of the endless sieve belt (1) is comprised within one single plane which lies substantially perpendicular to the direction of flow of the liquid current (20).

Abstract: A filter screen that is used in filtering water and that includes a frame and a grid assembly that is supported by the frame for movement. The grid assembly includes a continuous unbroken drive chain having a guide link, and a screen panel. The screen panel is coupled to the guide link for selective movement between an operating condition and a maintenance condition. When the screen panel is in the operating condition the screen panel is fixed relative to the guide link for movement with the guide link and for filtering water. In the maintenance condition, the screen panel is pivotable relative to the guide link to permit access to the interior of the filter screen for inspection of chain components.

Abstract: A waste water filter screen assembly that has a substantially open foot section to promote more efficient flow through. The rotating grid is generally free hanging. The present invention further provides a drive assembly with square, high friction drive drums mounted on the drive shaft. The present invention further provides idler roller assemblies mounted for guiding the rotating grid adjacent the filter screen assembly head. The open foot section, drive assembly and idler roller assembly are useable with filter grids of both the link element type and the panel type.

Abstract: A filter screen that is used in filtering water and that includes a frame and a grid assembly that is supported by the frame for movement. The grid assembly includes a continuous unbroken drive chain having a guide link, and a screen panel. The screen panel is coupled to the guide link for selective movement between an operating condition and a maintenance condition. When the screen panel is in the operating condition the screen panel is fixed relative to the guide link for movement with the guide link and for filtering water. In the maintenance condition, the screen panel is pivotable relative to the guide link to permit access to the interior of the filter screen for inspection of chain components.

Abstract: A travelling screen and screening method minimize reintroducing debris to liquid downstream of a screen while achieving the relatively high efficiency of fixed bar screens. A filter surface is defined by a pair of planar plates, each of the plates having openings through which the liquid but not the debris may flow. A connector between the plates positions the plates relative to each other at a selected fixed angle. The connector formed integrally with each of the plates has the planar plates and the connector formed from one sheet and the connector in the form of a bend. A guide mounts a first travelling screen element adjacent to a second such element at a screen element scraper path with one planar plate of the first screen element being oriented relative to one planar plate of the second screen element to define a linear scraper path. The guide also positions the first and second screen elements adjacent to each other along a debris separation path.

Abstract: A method and an apparatus for reducing the moisture content bound by capillary action in fiber cells. To include fine material economically and easily in the process, coarse material is sandwiched on top of fine material and then pressed and dried. The material prepared by grinding and screening is transferred as coarse material to a first spreader hopper, and the screened fine material is transferred over a chute and conveyor belt to a second spreader hopper. The fine material is spread in a thin layer through a vertically adjustable gate from the second spreader hopper onto a spreading, loading and filtering belt, and the coarse material is withdrawn on a transfer conveyor belt running below the first spreader hopper and then is spread through a vertically adjustable gate onto the fine layer, to form a sandwich-like mat.

Abstract: A sewage screening apparatus which receives, in use, a sewage flow comprising a screen arrangement having a continuous belt screen for capturing screenings contained within the sewage flow to enable their subsequent removal therefrom. The apparatus also includes an impeller for generating a turbulence effect within the sewage flow to effect washing of the screenings contained within the sewage flow prior to their removal therefrom. The impeller is located within the screen arrangement.

Abstract: The invention relates to a revolving screening rack with a driveable endless screening belt formed by a plurality of screening elements which in each case have a plurality of elongate plates arranged parallel to and at a distance from one another, a bar-shaped connecting element engaging in each case through the plates at their two ends, said connecting element pivotably connecting the plates, engaging one into the other at least in regions, of two screening elements to one another in the manner of a link chain, with a pivotably mounted rack hook element which is capable of being pivotably displaced, at least partially, between two plates located next to one another, and with a steering lever for the rack hook element, said steering lever being pivotably articulated at one end on the rack hook element, said revolving screening rack being distinguished in that the other end (20) of the steering lever (17) is pivotably mounted on the screening belt (2).

Abstract: A mechanical screen employs at least one filter chamber which includes a chassis in the form of a frame and a filter panel disposed transversely in the opening of the chassis and appropriately attached to it. Clipping elements between the filter panel and the chassis are used to attach the filter panel to the chassis. The filter panel, the uprights of the chassis and its longitudinal members are preferably made from materials inert to corrosion. Applications include chain filters.

Abstract: A basket for a traveling water screen which includes a top rail with a pair of spaced apart end members at opposite ends of the top rail which are joined to the top rail. A water screen extends between the end members and includes an upper edge portion supported by the top rail, and a lower edge portion opposite the upper edge portion, and opposite edges supported by the spaced apart end members. A lower channel rail extends between the spaced apart end members and supports the lower edge portion of the water screen with the lower channel rail defining an internal channel having a smooth arcuate inner surface. An insert in the form of an elongated member is positioned in the bottom, back downstream side of the channel and forms a quiescent condition in the bottom of said channel when the basket is exposed to a flowing water stream.

Abstract: An endless screen lifts fecal matter and sewer influent debris from an influent channel. The endless screen is powered by an externally positioned air cylinder driving a pawl and rachet to move the screen in an elliptical path. A tank positioned below a top drop point for the screen receives the fecal matter and debris. A paddle mixer breaks up the fecal matter for return to the sewer channel and a conveyor picks up the debris and deposits it in a landfill receptacle.

Abstract: A continuous-belt drilling mud separation unit is removably mounted in a box-like housing disposed in the flow path of drilling mud or drilling fluids and is operated by a motor on the housing. The separation unit includes a generally rectangular frame, a tensioning system, and a wide continuous belt in the form of a mesh screen, chain, self-cleaning chain link belt, or combination chain link belt and wire mesh screen which extends around rollers or sprockets and is driven in a continuous loop moving along the longitudinal axis of the frame. As drilling mud or drilling fluids are conducted onto the moving belt, liquids and particles smaller than the openings in the belt pass through the openings and liquids and particles larger than the openings are transported on the moving belt and are discharged off of one end as the belt completes its path.

Abstract: An endless filter chain for filtering a liquid, such as sewage, which flows along a drainage duct is provided. The filter chain comprises strainer elements and connecting links interconnected to allow the strainer elements to pivot about respective axes of the connecting links while maintaining a small clearance between the leading edge of each strainer element and the trailing edge of the respective adjacent preceding element while the filter chain is trained about an upper and a lower turning roller. the filter chain does not comprise conveyor chains and the strainer elements can be sized to a width where they cover practically the entire width of the drainage duct. A method and an apparatus for filtering liquid as well as a strainer element and a connecting link are provided.

Abstract: A traveling water and fish screen device is provided for separating debris from channels of flowing of water. The device includes a carriage that is placed in the water flow and a screen mounted in the carriage which utilizes a continuous band of specially constructed rigid grate panels pivotally attached to and separated by support members in the form of cross bars between each panel. Special hinges are used which provide an extremely small gap between each panel and the adjacent cross bars, which gap is maintained as the as the band rotates around upper and lower cylinders in the carriage. Flaps are provided on the outward, upstream edges of the carriage to prevent debris from coming into contact with the cylinders, support chains or sprockets of the device. The rigid grate panels each have a first set of parallel cross members, and a second set of parallel cross members that are perpendicular to the first set.

Abstract: A screen assembly is described which comprises a flow channel along which sewage is intended to flow, in use, a continuous flexible belt entrained around roller or wheel means and projecting into the channel, and means for driving the belt. The belt is perforated such that relatively large solids carried along the flow channel in the sewage are trapped by the belt adhering thereto due to a pressure differential across the belt. Movement of the belt lifts such solids from the flow channel. The belt is of thickness less than or equal to 1 mm.

Abstract: A device for removing floating and suspended debris from a liquid flow passed through a liquid flow flume (3) is disclosed, the device including a separator (9) positioned within the liquid flow flume at an angle with respect to the flume and extending across the path of the liquid stream for collecting floating and suspended debris thereon. An elongated conveyor assembly (10) having an elongated tubular housing (20) with a first conveyor portion (11) and a second conveyor portion (12) is also provided as a part of the device. The first conveyor portion of the conveyor assembly is positioned within the separator and extends therefrom, the first portion of the conveyor assembly, as well as the conveyor assembly, being independently supported with respect to, and without being formed as a part of, the separator.

Abstract: A method for removing debris from a free flowing water system (100) using an improved filter apparatus (10) is described. The apparatus includes a rail (12) which is mounted adjacent the water supply intake opening (102) and a continuous belt (36) made of chain links (38) and connectors (44) which mounts around an upper sprocket cylinder (26) and a lower sprocket cylinder (32) spaced between the ends of the rail. Openings (42) in the belt collect debris from the water flowing through the belt. The connectors have lifters (50) which move the debris collected on the front side (36A) of the belt and tilt to dump any debris of excess weight back into the water system. As the belt moves upward, the debris collected on the belt and by the lifters is moved out of the water system toward the top of the rail. As the belt moves over the upper sprocket cylinder, the upper sprocket teeth (28A) extend through the openings of the belt loosening the debris trapped on the front side of the belt.

Abstract: An improved filter apparatus (10) for removing debris from a free flowing water system (100) is described. The apparatus includes a rail (12) which is mounted adjacent the water supply intake opening (102) and a continuous belt (36) made of chain links (38) and connectors (44) which mounts around an upper sprocket cylinder (26) and a lower sprocket cylinder (32) spaced between the ends of the rail. Openings (42) in the belt collect debris from the water flowing through the belt. The connectors have lifters (50) which move the debris collected on the front side (36A) of the belt and are able to tilt to dump any debris of excess weight back into the water system. The belt is moved upward by a motor (54) which rotates the upper sprocket cylinder. As the belt moves upward, the debris collected on the belt and by the lifters is moved out of the water system toward the top of the rail.

Abstract: Conveyor-band filter apparatuses, so-called Paternoster filter rakes, which serve primarily for the mechanical cleansing of flowing sewage, are to be made capable by the invention of removing not only the normal filtered material, but also coarser fragments, from the conduit through which the sewage flows, without the usually steep conveying angle having to be varied; for this purpose, filter elements of the endless filter band are arranged in each case on the chain links and are designed on their end faces in such a way that only a small gap remains even in the state in which they are mutually pivoted relative to one another. Furthermore, attached to the filter elements are filter rakes forming a horizontal lifting face which extends transversely through the conduit and which can nevertheless be kept clean by corresponding stripping devices.